THE BULLSHOOTER ENDLESS LOOP VOICE RECORDER Ramsey Electronics Model No. BS2C Announcing an event is now easier than ever! Just say it once and hear it over and over. Easy transmitter hookup for broadcasting. • Operates on 5 to 12 Volts DC, 250mA at maximum volume. • Records both line levels and microphone levels, front panel switchable. • Internal microphone included, has external microphone jack for higher fidelity. • Adjustable line level output.
RAMSEY TRANSMITTER KITS • FM100B Professional FM Stereo Transmitter • FM25B Synthesized Stereo Transmitter • AM1, AM25 AM Transmitters • TV6 Television Transmitter RAMSEY RECEIVER KITS • FR1 FM Broadcast Receiver • AR1 Aircraft Band Receiver • SR2 Shortwave Receiver • AA7 Active Antenna • SC1 Shortwave Converter RAMSEY HOBBY KITS • SG7 Personal Speed Radar • SS70A Speech Scrambler • SP1 Speakerphone • WCT20 Wizard Cable Tracer • PH10 Peak hold Meter • LC1 Inductance-Capacitance Meter RAMSEY AMATEUR RADIO KI
Ramsey Publication No. MBS2 Price $5.00 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR THE BULLSHOOTER ENDLESS LOOP VOICE RECORDER TABLE OF CONTENTS Introduction ............................................ 4 Circuit Description.................................. 5 BS2C Parts List...................................... 7 Parts Layout Diagram ............................ 9 Assembly Procedure............................ 10 Schematic Diagram.............................. 14 Initial Testing and Operation .............
INTRODUCTION Each of us at one time or another has probably heard an endless loop player repeating a list of movies playing at the local theatre, or advertising a house for sale through your car radio. Sure could be handy around the house occasionally, or maybe down at the local flea market. Could you modify a cassette or CD player to duplicate this function? Good luck! Where could you even find that sort of machine anyway, and how much would it cost? Enter the BS2C Bullshooter.
BS2C CIRCUIT DESCRIPTION We will go through the BS2C section by section, but most circuitry that used to be in separate circuits in the BS1 has been fully integrated into the BS2C main chip. For example, you can switch between the microphone and line inputs digitally so you can select them using the front panel switches. The part also contains a speaker power amplifier so we no longer need a separate IC for this.
sample rates. . . all controlled through a serial access method (called SPI for Serial Peripheral Interface) by the microcontroller. This truly is an amazing part! There are so many features that we couldn't take advantage of them all, but are using some of the best ones for this product. The Display: The display is driven by a serial shift register rather than a display decoder so we can have more versatility in the number of digits shown.
PARTS SUPPLIED WITH BS2C VOICE RECORDER KIT Capacitors 9 0.1uF ceramic capacitors (Marked 104) [C5,7,9,11,13,15,17,19,20] 2 0.01uF ceramic capacitors (Marked 103) [C8,10] 1 10pF ceramic capacitor (Marked 10p or 10) [C18] 1 4.
Required, not supplied 6 Volt DC power transformer Optional Line level audio source (such as a tape deck or CD player) Shielded stereo audio cables Speaker Case and Knob Parts Top Cover Bottom Base Tray 4 - Short Phillips Head Screws 2 - Long Phillips Screws Front and Rear Plastic Panels with Labels 4 - Rubber Feet Appropriate Knobs for Kit Required Tools Pen or Pencil Small Phillips Head Screwdriver Soldering Iron 60/40 Rosin Core Solder Wire Clippers Safety Glasses BS2 • 8
BS2C PARTS LAYOUT DIAGRAM BS2 • 9
RAMSEY "LEARN-AS-YOU-BUILD" ASSEMBLY STRATEGY As you can see in examining the circuit board and components, there is a bit more to this voice recorder kit than just soldering a few parts. So that you don't spend extra time "troubleshooting" instead of enjoying your new kit, we strongly recommend that you follow the assembly strategy and step-by-step procedures we provide. Our strategy in installing parts on our PC board is to install the larger and more obvious parts such as the connectors and controls.
Since you may appreciate some “warm-up” soldering practice as well as a chance to put some “landmarks” on the PC board, we’ll first install some of the larger components. Have a look at the Parts Layout Diagram to help with your assembly. We’ll start with the larger PC board and work our way through that before tackling the smaller front panel board. The first parts we’ll install will be the IC sockets, and there’s a reason for that.
which means that it must be installed in the proper orientation to work correctly. You’ll note that there’s a stripe or band at one end of the part and a band marked on the PC board silkscreen and Parts Layout Diagram. Align the two bands and solder the diode in place. 9. Install C3, 470uF electrolytic capacitor (marked 470uF). Because this is an electrolytic cap it has a polarity and must be installed correctly in order to function.
Those last few parts are the power supply section of our kit, taking the raw DC input to the kit and smoothing it out for all the circuits. Ready to move on? 13. Install R3, 10k ohms (brown-black-orange). Resistors can be installed in either direction but your kit will look better if you have all the gold bands lined up the same way. 14. Install R7, the only 1k ohm resistor in this kit (brown-black-red). Check the color code to be sure that the red stripe is really red and not orange like the 10k’s. 15.
BS2 • 14
BS2 • 15
29. Install C16, 10uF electrolytic cap. Yes, watch the polarity again. 30. Install R27, 10k ohms (brown-black-orange). 31. Install R14, 2.2k ohms (red-red-red). 32. Install R11, another 2.2k ohm resistor (red-red-red). 33. Install R16, 2.2k ohms (red-red-red). It’s hiding between the MIC and LINE IN jacks. 34. Install C11, 0.1uF ceramic disc capacitor (marked 104). 35. Install C13, 0.1uF ceramic disc capacitor (marked 104). 36. Install C14, the other big 470uF electrolytic capacitor.
47. Install R19, 10k ohms (brown-black-orange). 48. Install R15, 330 ohms (orange-orange-brown). 49. Install R20, 21, and 22, all 10k ohms (brown-black-orange). 50. Now we’ll move to the other end of the PC board. Install C6, 10uF electrolytic capacitor. Watch orientation! 51. Install R6, the 1k ohm vertical trimmer pot (marked 102). It only fits into the board one way. Solidly solder all three pins. 52. Install J12, the 3.5mm monaural style switch jack.
flat side on the part. Line these flat sides up and the diodes will be installed correctly. If installed backwards they will never light. Install D6, the red LED, by correctly orienting the flat side on the part with the flat side shown on the PC board silkscreen and Parts Layout Diagram. Leave the leads between the bottom of the part and the PC board at least 1/2 inch long. Solder both leads. When you clip the leads off the back of the board leave a little extra on this part and on D5.
• Solder shorts between components. Check your schematic and parts layout diagrams if you suspect a fault. • Proper orientation of diodes, capacitors, and ICs. • Ensure proper power supply polarity and voltage (5 to 12 volts DC, center positive) All finished checking your kit over? I went and got a glass of water to give you time to thoroughly examine your solder joints and parts placement, knowing that you wouldn’t want to leave me sitting here idly waiting for you.
be flush and square. Once you have things where you want them, take your soldering iron and tack solder the two outside pins of the two outside 8 pin headers to hold the whole thing in place. 70. Now is the time to check your LED placement, while the header solder joints cool and before you pull the main board back out. If the LEDs poke through the case as far as you want them to, then you’re finished with this step.
1 2 3 4 5 6 7 8 2 3 4 5 6 7 8 Time 1 Time EOM 1 2 3 4 5 6 7 8 Time Using the BS2C = Used Space = Unused Space Recorder Layout The BS2C’s memory is laid out like a timeline, and the BS2C software can jump to any absolute position within that line. You can think of it like a piece of tape laid out in a long strip. It is then divided into eight equal pieces that mark the start point for any one of eight messages. The BS2C can instantly go to any one of these eight points.
To change the sample rate of the BS2C, power it down, then press and hold the PAUSE button while powering the unit on. The display will show three dashes to indicate sample rate selection. Now press the UP DOWN keys to select from one of four sample rates. When finished, press the STOP button to save changes and get back into normal operation at the new rate. Sample Mode Sample Rate Recording Time Passband 1 4kHz 8 minutes 1.7kHz 2 5kHz 6.4 minutes 2.3kHz 3 6kHz 5.3 minutes 2.
button first and then try to select the location you’ll see letters on the display. The letters indicate the volume level, as explained in the next section. Be sure to select the location first before hitting PLAY. Now it does get a little more complex if you want to replay the same message over and over again rather than the default mode of play once only. To change to the new repeat mode, power down the BS2C, and then power it back up while holding the PLAY button down.
the highest, L being the lowest. When you change the volume setting, always hit PLAY to lock the setting in. If not, it will default to a preset volume level. Lock Mode To enable the lock down mode requires a bit of finesse. You have to press all three buttons, UP, DOWN, and STOP, at the same time to toggle the lock mode on and off. The hope is that most people casually messing with your kit will not bother to figure that out.
CASE UP INSTRUCTIONS: The enclosure is a key element to the overall pride you will have upon completing your Ramsey kit. The enclosure will show how you were able to “build from scratch” a commercial piece of high-tech electronics. For some of us, the enclosure will also hide a number of “not-so-pretty” assembly mistakes. Once the kit is enclosed your friends will never know that you were new to soldering.
TROUBLESHOOTING Won’t record from Microphone and/or Line In. 1. Check to make sure you have the proper recording mode selected. The decimal point on the numeric display indicates the mode. If in microphone mode, the LED is off. If in line-record mode, the LED is on. Check your source and be sure you don’t have both an external microphone and a line level audio source plugged in at the same time. 2. You have to press BOTH PLAY and RECORD at the same time.
The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved without contacting the factory. Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All Ramsey kits will work if assembled properly. The very fact that your kit includes this new manual is your assurance that a team of knowledgeable people have field-tested several "copies" of this kit straight from the Ramsey Inventory.
BS2C Endless Loop Voice Recorder Kit Quick Reference Page Guide Introduction ............................................ 4 Circuit Description .................................. 5 BS2C Parts List...................................... 7 Parts Layout Diagram ............................ 9 Schematic Diagram.............................. 14 Using the BS2C.................................... 20 Troubleshooting ................................... 26 Warranty...............................................
